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CAS REGISTRY - The gold standard for chemical substance information

CAS REGISTRYSM contains more than 146 million unique organic and inorganic chemical substances, such as alloys, coordination compounds, minerals, mixtures, polymers and salts, and more than 67 million sequences - more than any other database of its kind.

When you need to positively identify a chemical substance, you can rely on the authoritative source for chemical names and structures of CAS REGISTRY. You can also identify your substance of interest by its CAS Registry Number®, which is universally used to provide a unique, unmistakable identifier for chemical substances. If your organization uses CAS Registry Numbers to help others locate accurate chemical information, please refer to the CAS RN Verified Partner Program information to ensure appropriate licensing and use.

All substance records contain a unique CAS Registry Number. Records may also have CA index names, synonyms, structure diagrams, stereochemistry, molecular formulas, ring data, alloy composition tables, protein and nucleic acid sequences, classes for polymers, and the number of references in the CA/CAplus databases. All of this information is displayable and searchable on STN, but some of it is only displayable in SciFinder.

Sample record from SciFinder®

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